南沙西南部下地壳高速层成因

李凯; 沈传波; 谢晓军; 赵志刚; 彭希; 周延冰

doi:10.3799/dqkx.2018.328

Volume 44 Issue 3

Mar. 2019

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Li Kai, Shen Chuanbo, Xie Xiaojun, Zhao Zhigang, Peng Xi, Zhou Yanbing, 2019. Origin of High Velocity Layer in Lower Crust of Southwestern Nansha Block. Earth Science, 44(3): 810-821. doi: 10.3799/dqkx.2018.328

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Li Kai, Shen Chuanbo, Xie Xiaojun, Zhao Zhigang, Peng Xi, Zhou Yanbing, 2019. Origin of High Velocity Layer in Lower Crust of Southwestern Nansha Block. Earth Science, 44(3): 810-821. doi: 10.3799/dqkx.2018.328

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Origin of High Velocity Layer in Lower Crust of Southwestern Nansha Block

doi: 10.3799/dqkx.2018.328

Li Kai^{1,2
,},
Shen Chuanbo^{1,2
,
,},
Xie Xiaojun³,
Zhao Zhigang³,
Peng Xi^1,2,
Zhou Yanbing^1,2

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
CNOOC Research Institute Ltd., Beijing 100028, China

Received Date: 2018-10-12
Publish Date: 2019-03-15

Abstract

Abstract

The controversy over the genesis of the high velocity layer limits the understanding of the deep structure, tectonic evolution and complete evolution of the South China Sea.In order to understand the origin of high velocity layer in the lower crust of the southwestern Nansha block, the joint inversion of gravity and seismic data was performed by using Oasis Montaj software in this study.The seismic profile is across the southwestern Nansha Block.The Moho undulation, crustal thickness and the distribution of the high velocity layer are recorded.The regional extension factor and the temperature at the high layer depth are calculated, and the age of volcanic eruption is determined by seismic features.The whole crustal stretching factor of the Nanweixi Basin and the Liyue Basin area is 1.5-4.0, which is impossible to develop serpentine.The whole crustal stretching factor is up to 11.2 in the Nansha trough.The serpentine is formed by the reaction of peridotite and sea water which enters the mantle through the fractures.The temperature near the high velocity layer is lower than the stable temperature of the serpentine.The volcanic eruption was found in the same place in the seismic profile, and the volcano formed after the cessation of the spreading of the South China Sea.The results indicate that the high velocity layer of the southwestern Nansha Block can be divided into two types.The high velocity layer in the Nanweixi and the Liyue basins is formed by volcanic eruption after the cessation of the spreading of the South China Sea; and the other section in the Nansha trough basin is a mixture of serpentinized peridotite and late magma.
- Nansha,
- deep crustal structure,
- high velocity layer,
- volcano,
- stretch factor,
- serpentinization,
- marine geology

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Origin of High Velocity Layer in Lower Crust of Southwestern Nansha Block

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